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Problems solved by technology
This type of cylinder liner mainly depends on the reduction of carbon equivalent and alloy strengthening to meet the requirements of strength and wear resistance. The tensile strength is generally below 350MPa, and the strength and wear resistance are poor, which cannot meet the requirements of energy saving and consumption reduction for high-power engines. , development requirements for emission reduction
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Embodiment 1
[0029] High-strength wear-resistant cylinder liner, its weight percentage is composed of (%):
[0030] C: 3.25, Si: 2.25, P: 0.35, S: 0.08, Mn: 0.5, Mo: 0.2, Nb: 0.082, and the balance is Fe.
[0031] The preparation method is as follows:
[0032] Centrifugal casting: the casting temperature is 1380°C, and the centrifuge speed is 1360 rpm.
[0033] Machining: The cylinder liner blank is processed into a semi-finished product, with a margin of 0.5mm in the inner hole and outer circle; the thickness of the cylinder wall on one side of the semi-finished product is 8mm, and the pre-cooling time is 36 seconds.
[0034] Heat treatment: Put the cylinder liner in a controlled atmosphere furnace at 920°C for 1.5 hours to austenitize, then quench it into a salt bath composed of 50% potassiumnitrate + 50% sodiumnitrate, hold it at 340°C for 75 minutes; Fire 2h.
[0035] It can be seen from Figure 1-3 that the obtained cylinder liner structure is acicular ferrite and carbon-rich aust...
Embodiment 2
[0037] High-strength wear-resistant cylinder liner, its weight percentage is composed of (%):
[0038] C: 3.2, Si: 2.15, P: 0.35, S: 0.07, Mn: 0.35, Mo: 0.26, Nb: 0.12, and the balance is Fe.
[0039] The preparation method is as follows:
[0040] Centrifugal casting: the casting temperature is 1400°C, and the centrifuge speed is 1380 rpm.
[0041] Machining: Process the cylinder liner blank into a semi-finished product, leaving 0.5mm allowance for the inner hole and outer circle.
[0042] Heat treatment: Put the cylinder liner in a controlled atmosphere furnace at 920°C for austenitization for 100 minutes, then quench it into a salt bath composed of 50% potassiumnitrate + 50% sodium nitrate, hold it at 330°C for 85 minutes; then temper at 180°C at low temperature 2h.
[0043] It can be seen from Figure 4-6 that the obtained cylinder liner structure is acicular ferrite and carbon-rich austenite. Under the condition of magnification of 100 times, the length of graphite is 4...
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Abstract
A cylinder liner with high strength and wear resistance and a manufacturing method thereof are provided. The composition of the cylinder liner is (wt%) as following: C 3.0-3.3%,Si 2.0-2.3%,P 0.3-0.6%,S<0.1%,Mn 0.3-0.6%,Mo 0.1-0.3%,Nb 0.08-0.15%,and the balance Fe. The buildup of the cylinder liner is phosphorus-containing acicular ferrite and carbon-rich austenite, wherein the phosphorus eutectic is no less than 3%. The cylinder liner with hardness of HRC 38-43, Rm>400MPa, high strength and good wear resistance, solves the problem of pearlite cylinder liner with low wear resistance and cast bainite with bad corrosion resistance.
Description
technical field [0001] The invention belongs to the technical field of engine accessories, in particular to a high-strength wear-resistant cylinder liner and a preparation method thereof. Background technique [0002] The cylinder liner is one of the key parts of the engine. At present, its material is mostly ordinary gray cast iron or alloy gray cast iron. This type of cylinder liner mainly depends on the reduction of carbon equivalent and alloy strengthening to meet the requirements of strength and wear resistance. The tensile strength is generally below 350MPa, and the strength and wear resistance are poor, which cannot meet the requirements of energy saving and consumption reduction for high-power engines. , Development requirements for emission reduction. At present, almost all cylinder liner cast iron products at home and abroad are developing in the direction of low emission. The use of EGR has higher requirements on the wear resistance and corrosion resistance of th...
Claims
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